- #1
Arnoldjavs3
- 191
- 3
Homework Statement
$$sinx - cosx = 1/3$$
solve for $$sin(2x)$$
Homework Equations
$$sin^2x + cos^2x = 1$$
$$sin2x = 2cosxsinx$$
The Attempt at a Solution
I think you can square both sides and get:
$$sin^2x - cos^2x = 1/9$$
But how can I use this information to solve for sin2x? Is there a relation/identity between sin2x and sin^2x?
But I am unsure of what to do proceeding this point, is there any calculus needed here? It's in my Calculus review problems so I am confused.